Improvement in eyeglasses



UNI'IYED STATES ISAAO ALEXANDER, OF WASHINGTON, DIS'IR1GT OF COLUMBIA.

IMPROVEMENTiN EYEGLASSES.

Specifieation forming part of Letters Patent No.-I74753, dated March 14,1876; applicaizion filed February 19, 1876. 1

T0 all whom z't mag; concem the oity of Washington, in the oounty ofWashington i1nd Disbriob of Golumbin, have invented certnin new anduseful Improve-. ments in Eyeglasses, of whicht he following is aspeoifiention, ref'erenoe being had 130 the acoo mpanyiug drmvings,making part: of the same, in which Figure 1 represents a, plan 0r front;view of the glasses in the position they will stand in relation to euchotlier when upon the face; Fig. 2, a similarviewshowing tl1e posit'ionthey assuxne' when rem0ved from the f'aoe; Fig. 3, a m'odifioation ofthe adjustable spring; Fig. 4, a plan of a piece of metal, fron1 whiohthe modified i'orm of spring shown in Fig. 3 may be made; und Fig'. 5, apiau from which the spring as shown in Figs 1 and 2 may be made from nsingle piece of metal, if desired.

The object oi' my inventioi1 is so L0 ooustruot or conneut; a pair oi'eyeglnsses that; When in use they will be in a line straight aoross thefaoe, like tlne ordinary spectacles, so that the irame or margin of thelenS will. in no way obstruct the si'ght; also, to regulate theirclampingpressure to any degree desired eo make thexn a comforbable undeasy fit, and. 110 acoomplish whioh I oonstrnot a spring, A, oi' theform shown in the drawin'gs, having a;setscrew pussing through theportion a thereof, so that, by turning it; either one way or t;he

other, (to the rigi1t; or lefls)ifiwill either sepa. rate or allow thebranches ofthe spring to approaoh each other. This spring mny be a13'-tached 1:0 the Ions itself, as shown, or to ehe neoted b v a spring, G,of tl 1e formshown.

Althongh have shown be spring A a s V oonnected wioh each'lens of apnir' ot' eyglusses, I have found that.one will answer. .Ti1is springnmy be made as shown in Fig. 3. v

'lhe glasses may befolded and locked in t;he ordinary manner.

Ifiwill be observed that the springs A A v und C, when 'oonneoted, fornian aldjustable spring-einmp, for holdiiig tl1e glasses =secured theret oto the fao'e.

What I olairn as of my own invention isl. The s'pring-clamp foreyeglasses, made ad justable by a seb-screw, substznntially as and fort;he pu'rpose set forth.

2. 'Ihe spring A for eyeglass-olamps, made adjustable, substantinlly asshown am]. desoribed.

. In testimony whereof I hzwe hereunto s1ibsoribed m y na-rne.

o ISAAO ALEXANDER.

' Witnesses: v

FRED. STEBBINS,

A. G. DE LONG.

